Knowledge
Like-for-like- Gemini 3.5 Flash
- 40.2
- GLM-5.1
- 52.3
- Weighted basis
- 1 vs 1 rows
- Reading
- GLM-5.1 leads
Gemini 3.5 Flash vs GLM-5.1
Updated August 18, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
Decision reading
GLM-5.1 has the higher public score estimate, 66.91 versus 64.67, but the 90% score intervals overlap. Treat that as a lead, not a settled winner.
10 results are shared. Category rows based on different benchmark sets are marked directional and do not name a winner.
Which one for your work
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Long documents
Prompts that approach the documented context limit
Gemini 3.5 Flash
Gemini 3.5 Flash has the larger documented context window.
Confidence: documented
Chat turn cost
1K fresh input + 500 output tokens
GLM-5.1
GLM-5.1 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Show secondary and unsupported calls
Repository review cost
50K fresh input + 3K output tokens
GLM-5.1
GLM-5.1 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
The category averages use different weighted benchmark sets, so they are directional rather than like-for-like.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
The category averages use different weighted benchmark sets, so they are directional rather than like-for-like.
Confidence: limited
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
The page does not recommend a cost winner because at least one model cannot fit the stated workload in one request. GLM-5.1 does not fit this workload in one request. GLM-5.1 has no published cached-input rate, so cached tokens use its listed input rate.
Confidence: rate-fallback
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
13 Gemini 3.5 Flash only
10 Shared
10 GLM-5.1 only
- Shared results
- 10
- Gemini 3.5 Flash only
- 13
- GLM-5.1 only
- 10
- Like-for-like categories
- 1 / 8
3 categories use different evidence sets. Those rows remain visible for coverage context but do not name a winner.
Category results, on a stated basis
Each row states whether both averages use the same weighted benchmark set. Directional and not-comparable rows remain visible, but they never receive a winner in this template.
Agentic
Directional only- Gemini 3.5 Flash
- 77.2
- GLM-5.1
- 65.4
- Weighted basis
- 2 vs 2 rows
- Reading
- Directional only
Coding
Directional only- Gemini 3.5 Flash
- 55.1
- GLM-5.1
- 61.3
- Weighted basis
- 1 vs 2 rows
- Reading
- Directional only
Math
Directional only- Gemini 3.5 Flash
- 32.9
- GLM-5.1
- 62.0
- Weighted basis
- 2 vs 4 rows
- Reading
- Directional only
Reasoning
Not comparable- Gemini 3.5 Flash
- 74.7
- GLM-5.1
- Not measured
- Weighted basis
- 2 vs 0 rows
- Reading
- Not comparable
Multilingual
Not comparable- Gemini 3.5 Flash
- Not measured
- GLM-5.1
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Multimodal
Not comparable- Gemini 3.5 Flash
- 83.8
- GLM-5.1
- Not measured
- Weighted basis
- 2 vs 0 rows
- Reading
- Not comparable
Instruction following
Not comparable- Gemini 3.5 Flash
- Not measured
- GLM-5.1
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
| Category | Gemini 3.5 Flash | GLM-5.1 | Weighted basis | Reading |
|---|---|---|---|---|
| Knowledge | 40.2 | 52.3 | Like-for-like1 vs 1 rows | GLM-5.1 leads |
| Agentic | 77.2 | 65.4 | Directional only2 vs 2 rows | Directional only |
| Coding | 55.1 | 61.3 | Directional only1 vs 2 rows | Directional only |
| Math | 32.9 | 62.0 | Directional only2 vs 4 rows | Directional only |
| Reasoning | 74.7 | Not measured | Not comparable2 vs 0 rows | Not comparable |
| Multilingual | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Multimodal | 83.8 | Not measured | Not comparable2 vs 0 rows | Not comparable |
| Instruction following | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
Shape of the matched evidence
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.
Terminal-Bench 2.0
Agentic
HLE
Knowledge
FrontierMath v2 (Tiers 1-3)
Math
SWE-bench Pro
Coding
FrontierMath v2 (Tier 4)
Math
What each workload costs
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
Chat turn
1K fresh input + 500 output tokens
- Gemini 3.5 Flash
- $0.006
- Fits in one request
- GLM-5.1
- $0.0036
- Fits in one request
GLM-5.1 has the lower modeled cost
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Gemini 3.5 Flash
- $0.102
- Fits in one request
- GLM-5.1
- $0.0832
- Fits in one request
GLM-5.1 has the lower modeled cost
Costs use the listed standard API rates.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- Gemini 3.5 Flash
- $0.15
- Fits in one request
- GLM-5.1
- $0.352
- Does not fit in one request
- Cached input priced at the published list-input rate
GLM-5.1 does not fit this workload in one request. GLM-5.1 has no published cached-input rate, so cached tokens use its listed input rate.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationGemini 3.5 FlashGLM-5.1
Context window
Maximum documented context; output-token limits may be lower.
Gemini 3.5 Flash
GLM-5.1
203K
API model ID
Gemini 3.5 Flash
gemini-3.5-flash
Google Gemini API pricingGLM-5.1
Not sourced
Cached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Gemini 3.5 Flash
$0.15 per 1M cached input tokens
Google Gemini API pricingGLM-5.1
Not published
Documented inputs
Gemini 3.5 Flash
Not sourced
GLM-5.1
Not sourced
Documented outputs
Gemini 3.5 Flash
Not sourced
GLM-5.1
Not sourced
Provider availability
Gemini 3.5 Flash
Not sourced
GLM-5.1
Not sourced
Reasoning profile
Gemini 3.5 Flash
Reasoning
GLM-5.1
Reasoning
Weight access
Gemini 3.5 Flash
Proprietary
GLM-5.1
Open Weight
License
Gemini 3.5 Flash
Proprietary
GLM-5.1
Open Weight
Release date
Gemini 3.5 Flash
2026-05-19
GLM-5.1
2026-04-07
If you already use one of these models
- Deployment change
- The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
- Quality signal
- GLM-5.1 has the higher public score estimate, 66.91 versus 64.67, but the 90% score intervals overlap.
- Workload cost
- Repository review: $0.102 vs $0.0832. Cache-heavy agent loop: $0.15 vs $0.352.
- Context tradeoff
- Gemini 3.5 Flash has the larger documented window (1M).
Run the same representative tasks against both endpoints before changing production traffic.
Self-host vs API cost
Estimates at 50,000 req/day · 1000 tokens/req average.
Gemini 3.5 Flash
API / mo$7,875
Self-host / moNot listed
Break-even—
Proprietary model — self-hosting not applicable.
GLM-5.1
API / mo$4,350
Self-host / mo$18,221
Break-even264M/day
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence33 rows
Agentic
Terminal-Bench 2.0
Gemini 3.5 Flash76.2%SourceGLM-5.163.5%SourceGemini 3.5 Flash leads this result
MCP Atlas
Gemini 3.5 Flash83.6%SourceGLM-5.171.8%SourceGemini 3.5 Flash leads this result
Toolathlon
Gemini 3.5 Flash56.5%SourceGLM-5.1—Not directly comparable
OSWorld-Verified
Gemini 3.5 Flash78.4%SourceGLM-5.1—Not directly comparable
Finance Agent v2
Gemini 3.5 Flash57.9%SourceGLM-5.1—Not directly comparable
Gert Labs
Shared sourceGemini 3.5 Flash61.85%GLM-5.160.11%Gemini 3.5 Flash leads this result
ResearchClawBench
Shared sourceGemini 3.5 Flash18.0%GLM-5.118.2%GLM-5.1 leads this result
BrowseComp
Gemini 3.5 Flash—GLM-5.168%SourceNot directly comparable
τ³-bench results
Gemini 3.5 Flash—GLM-5.170.6%SourceNot directly comparable
CyberGym
Gemini 3.5 Flash—GLM-5.168.7%SourceNot directly comparable
Claw-Eval
Gemini 3.5 Flash—GLM-5.162.3%SourceNot directly comparable
Coding
Terminal-Bench 2.0
Gemini 3.5 Flash76.2%SourceGLM-5.1—Not directly comparable
SWE-bench Pro
Gemini 3.5 Flash55.1%SourceGLM-5.158.4%SourceGLM-5.1 leads this result
Vibe Code Bench
Shared sourceGemini 3.5 Flash48.68%GLM-5.131.46%Gemini 3.5 Flash leads this result
cursorBench31
Gemini 3.5 Flash49.8%SourceGLM-5.1—Not directly comparable
cursorBench32
Gemini 3.5 Flash48.8%SourceGLM-5.1—Not directly comparable
EEBench
Gemini 3.5 Flash34.3%SourceGLM-5.1—Not directly comparable
NL2Repo
Gemini 3.5 Flash—GLM-5.142.7%SourceNot directly comparable
SWE-Rebench
Gemini 3.5 Flash—GLM-5.162.7%SourceNot directly comparable
Reasoning
Knowledge
Math
FrontierMath v2 (Tiers 1-3)
Shared sourceGemini 3.5 Flash38.966%GLM-5.133.448%Gemini 3.5 Flash leads this result
FrontierMath v2 (Tier 4)
Shared sourceGemini 3.5 Flash14.583%GLM-5.112.500%Gemini 3.5 Flash leads this result
AIME26
Gemini 3.5 Flash—GLM-5.195.3%SourceNot directly comparable
HMMT Nov 2025
Gemini 3.5 Flash—GLM-5.194.0%SourceNot directly comparable
HMMT Feb 2026
Gemini 3.5 Flash—GLM-5.182.6%SourceNot directly comparable
MMAnswerBench
Gemini 3.5 Flash—GLM-5.183.8%SourceNot directly comparable
Multimodal
Frequently asked questions
Which is better, Gemini 3.5 Flash or GLM-5.1?
GLM-5.1 has the higher public score estimate, 66.91 versus 64.67, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.
Which is better for coding, Gemini 3.5 Flash or GLM-5.1?
The current coding averages use different weighted benchmark sets, so BenchLM does not name a winner from them. Read the shared benchmark rows directly and test the models on the same task set.
Which is better for agentic tasks, Gemini 3.5 Flash or GLM-5.1?
The current agentic tasks averages use different weighted benchmark sets, so BenchLM does not name a winner from them. Read the shared benchmark rows directly and test the models on the same task set.
Which costs less, Gemini 3.5 Flash or GLM-5.1?
For the stated presets, chat costs $0.006 on Gemini 3.5 Flash and $0.0036 on GLM-5.1; repository review costs $0.102 and $0.0832; the cache-heavy agent loop costs $0.15 and $0.352. GLM-5.1 does not fit this workload in one request. GLM-5.1 has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, Gemini 3.5 Flash or GLM-5.1?
Gemini 3.5 Flash has the larger documented context window: 1M, compared with 203K.
Related comparisons
Last updated August 18, 2026
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